Niacin is vitamin b3 in its pure form. This supplement helps lower your bad cholesterol and raise your good cholesterol. Helps flush our your body which is why it is known for the "Niacin Flush" where your body will get very warm, red, and tingly for 15-20 minutes. This lets you know the niacin is going to work and taking effect so don't be worried! Niacin is a great source of energy known to be used for pre-workout and also for mental sharpness after the niacin flush.